I think they mean the transition that all IDE's are making towards an agentic interface, hiding the code completely as humans will not have to interact with it since the AI will be doing a better job at everything, even auditing it.
What is the exact definition of an IDE? JetBrain's products are as good as ever, in my opinion, but people have definitely made non-IDEs into big, hulking behemoths with tons of plugins. If anything, maybe "just an editor" is dead?